Electric ignition device.



PATENTED MAR. 17, 1903. N. SCHMITT 6r J KRANNICHIELDT.

ELECTRIC IGNITION DEVICE.-

APPLICATIONI'ILED FEB. 25.1902.

.N0 MODEL.

D I M ffm M I MM @Wa/ww,

- eUNITED STATES PATENT OFFICE.

NIKOLAUs sCHMITT AND JOHANN KHANNICHEELDT, on COLOGNE, GERMANY.

ELECTRIC IGNITION DEVICE.

SBECIFICATION forming part of Letters Patent N o. 722,913, dated March1'7, 1903.

Application led February 25, 1902. Serial No. 95,623. (No model.)

of Cologne-on-the-Rhine, in the Kingdom of- Irussia, German Empire,have'invented new and useful Improvements in Electric Ignition Devices,of which the following is a specification.

The ignition devicewhich forms the subject of this invention consists ofa short, thin,

these latter.

dat, and exible i nsulating-body, on oneV and the same surface of whichtwo short, thin, at, flexible, and electrically-conductive strips areattached at a slight distance apart. By this arrangement the position ofthe poles can be conveniently and absolutely fixed with regard to eachother and fracture of the priming or ignition wire is avoided. Formultiple simultaneous firing these fuses are of great Value, as they canbe constructed with absolute uniformity and there is no danger of thepoles bein g displaced relatively to each other.

In the accompanying drawings, Figure 1 is a front elevation of a atinsulating part provided with two metallic strips. Fig. 2 is a sectionon the line a; a: of Fig. 1. front elevation of a' modifiedconstructional form. Fig. 4 is a front elevation of a fiat insulatingpart provided with two metallic strips and an incandescing wireconnecting Fig. 5 is a front elevation of a modified constructionalform. Fig. 6 is a corresponding side elevation. Fig. 7 is an upper planView of the arrangement illus-V trated in Fig. 5, except that here theends of the igniting-wires are not shown as twisted together. Fig. 8 isa front elevation, upon a larger scale, ot' a form of igniting deviceadapted for producing flash-lightsfor photographic purposes and thelike. Fig. 9 is a section on the line y y of, Fig. 8. Fig. 10 is alongitudinal section through a complete igniting device provided with anouter casing and a spring-cap, and Figs. 11 to 15 illustrate furtherconstructional forms of igniting devices in accordance with thisinvention.

The same letters of reference are employed to indicate like parts.

In Figs. 1 and 2', a is a rectangular insulat- Fig. 3 is av ing part,which is provided upon one of its sides with two strips b of metal foilor paper, which are stuck, stitched, or otherwise suitably attachedthereto. These strips b terminate in points c, which come opposite eachother and are separated by a small space. These points serve as polesfor the electric discharge.

The constructional form represented in Fig. 3 differs from thatdescribed above only owing to a comparatively unimportant modication ofthe form of the covering-strips b and of the position of the points c.

The arrangement shown in Fig. 4 serves for the production of anincandescing igniter. Upon a Iiat insulating part ct are arranged twocovering-strips b, running parallel one with the other, and these stripsare connected by means of a fine incandescing wire d. This wire isattached to the strips b by means oi' beads of solder e. Figs. 5, 6, and7 illustrate the manner of manufacturing an incandescing igniting devicein which the incandescing wire is not soldered to the strips b. In thisform of the device after providing the dat insulating part with thestrips b the Wire d is wound around the insulating part, fitting in twoopposite notches or recesses in the same, as shown in Fig. 5. Theextremities of the wire d are then twisted together as tightly aspossible, (see Fig. 6,) so as to draw them closely against the metallicstrips. Of course the incandescing wire may be so arranged that itpasses through two small holes formed in the insulating part ctand thestrips b somewhat in the position in which the beads of solder careshown in Fig. 4, the extremities being then twisted together.

When the insulating part has been provided with the strips in one orother of these manners and the incandescing wire attached, (when this isdesired,) the igniting device g is completed byimmersion in apastyintlammable mass. mable mass g a pulverulent iniammable mass may beemployed. This is introduced into a small cap Z, Fig. 13, into which theinsulating part carrying the conducting-strips is inserted. This coveror cap is then closed by means of a plug of wax stearine or the likeInstead of this pasty inlaml IOO or by means of a cast block of sulfuror in any other suitable manner. Instead of arranging the iniiammablemass around one end of the insulating part ct it may be spread ingrooves formed in the said part. Fig. 1l

shows a longitudinal groove of this kind between the strips b. Fig. l2is a section on the line z z of Fig. 1l. Fig. 15 is a section on line zz' of Fig. 14;. In these two figures is shown an insulating part c,having a transverse groove formed therein after the application of thestrips b. The iniiam mable mass is introduced into this groove.

In Figs. 8 and 9 is shown a modified form of igniting device andprovided with a considerable quantity of infiammable material g. Thiscontains magnesium powder or other material adapted for producing adash-light suitable for photographic purposes, for visible signals onrailways, or for the use of troops in the field. Such igniting devicesare preferably provided with conducting-wires fn..

In Fig. 10 a complete igniting device is illustrated, in which the fuseis inserted in one end of a tube or casing h, and the charge is held ina spring-cap placed in the opposite end of said tube or casing or tubeh, the cap being open at the end above the fuse.

What We claim, and desire to secure by Letters Patent of the UnitedStates, is-

l. An electric ignition device comprising in combination a short, thin,dat and iiexible strip of non-conductive material; short, thin, flat andexible strips of conductive material disposed at a short distance aparton one and the same surface of, and carried by, said nonconductivestrip; a mass of combustible material provided between, and in contactwith, said two conductive strips; and means to assist the passage of theelectricity from one conductive strip to the other through saidcombustible mass; substantially as set forth.

2. An electric ignition device, comprising in combination acomparatively short, thin flat and iexible strip of nou-conductivematerial having a depression therein; comparatively short, thin, fiatand flexible strips of conductive material disposed on one and the samesurface of, and on opposite sides of the depression in, saidnon-conductive strip; a

mass of combustible material provided between said two conductivestrips; and means to assist the passage of the electricity from oneconductive strip to the other through said combustible mass;substantially as set forth.

The combination in an electric ignition device of a comparatively short,thin, flat and flexible strip of non-conductive material; comparativelyshort, thin, fiat and iiexible strips of conductive material disposed ata slight distance apart on one and the same surface of saidnon-conductive strip; and a mass of combustible material providedbetween said two conductive strips; substantially as set forthf 4. Anelectric ignition device comprising in combination a short, thin, flatand iiexible strip of non-conductive material; short, thin, flat andfiexible strips of conductive material disposed apart on one and thesame surface of said non-conductive strip; a priming mass connectingsaid conductive strips; means to assist the passage of electricity fromone conductive strip to the other through said combustible mass; asheath surrounding said strips of conductive and non-conductivematerials and said priming mass; a protecting and supporting cast massinside said sheath and surrounding said conductive and nonconductivestrips and leaving the extreme head of said priming mass free; and adetonating composition placed in said sheath adjacent to the exposedhead of said priming mass; substantially as set forth.

5. An electric ignition device comprising in combination a short, thin,iiat and iexible strip of non-conducting material; short, thin,

iiat and flexible strips of conductive material disposed apart on oneand the same surface of said non-conductive strip; a priming massconnecting said conductive strips; means to assist the passage ofelectricity from one conductive strip to the other through saidcombustible mass; a sheath surrounding said strips of conductive and nonconductive strips and said priming mass; and a protecting and supportingcast mass inside said sheath and surrounding said conductive andnon-conductive strips and leaving the eX- treme head of said primingmass free; substantially as set forth.

b. An electric ignition device comprising in combination a short,thin,fiat and iexible strip of non-conductive material; short, thin,fiat and flexible strips of conductive material disposed at a slightdistance apart on one and the same surface of said non-conductive strip;a mass of combustible material connecting said two conductive strips;means to assist the passage of electricity from one conductive strip tothe other; and means to connect said conductive strips with a source ofelectricity, substantially as set forth.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

NIKOLAUS SCHMITT. JOHANN KRANNICHFELDT. Witnesses:

CHARLES LEsIMPLE, CARL SCHMITT.

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